A former Baltimore city police technician arrested last month after police found 170 pounds of marijuana worth $510,000 in his North Laurel home was indicted June 6, according to Wayne Kirwan, spokesman for the state's attorney's office.

Manoj Unni, 30, of the 9300 block of Cross Timbers Court, was indicted on drug possession and manufacturing charges, Kirwan said. He is free on $25,000 bail.

Police said detectives were led to Unni's home by an anonymous tip, which was followed by an undercover operation, including surveillance, that gave them probable cause for a search warrant.

On May 9, police executed the search warrant and found "a substantial marijuana grow operation in the basement, including sophisticated growing equipment," police spokeswoman Sherry Llewellyn said at the time.

Police found 341 plants, which at full maturity yield about 170 pounds of marijuana worth $510,000, Llewellyn said. The plants were kept in two areas of the basement.

Police also found high-intensity lights, a dehumidifier, air filters, water pumping systems, lighting timers, a carbon dioxide system and a ventilation system, all of which can be used in growing the plants.

Baltimore Police confirmed last month that Unni worked for the agency as a crime lab technician from 2003 until January 2006. Anthony Guglielmi, the department's chief spokesman, said he could not comment on why Unni separated from the agency.